This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam.
讨二甲烷替代一氟三甲烷进行软质聚氨酯料的生产。
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Unfortunately, the polyurethane foam he used is inherently unstable.
不,他使用聚沫天生不稳定。
Polyurethane foam sealant was used during construction at the first floor underground, releasing flammable gases that accumulated to reach combustible conditions.
地下一层施工作业中使用聚沫填缝剂时,释放易燃气体局部积聚达到可燃条件。
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